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Unsecured Revolving Credit Facility (Change In The Operating Partnership's Unsecured Debt Ratings) (Details)
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9 Months Ended |
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Sep. 30, 2012
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No Ratings Or Less Than BBB-/Baa3 [Member]
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| Guarantor Obligations [Line Items] |
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| Unsecured Debt Ratings |
No ratings or less than BBB-/Baa3 |
| Interest Rate - Applicable Basis Points Above LIBOR |
1.85% |
| Facility Fee Basis Points |
0.45% |
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BBB- Or Baa3 [Member]
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| Guarantor Obligations [Line Items] |
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| Unsecured Debt Ratings |
BBB- or Baa3 |
| Interest Rate - Applicable Basis Points Above LIBOR |
1.50% |
| Facility Fee Basis Points |
0.35% |
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BBB Or Baa2 (Current) [Member]
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| Guarantor Obligations [Line Items] |
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| Unsecured Debt Ratings |
BBB or Baa2(current) |
| Interest Rate - Applicable Basis Points Above LIBOR |
1.25% |
| Facility Fee Basis Points |
0.25% |
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BBB+ Or Baa1 [Member]
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| Guarantor Obligations [Line Items] |
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| Unsecured Debt Ratings |
BBB+or Baa1 |
| Interest Rate - Applicable Basis Points Above LIBOR |
1.075% |
| Facility Fee Basis Points |
0.20% |
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A- Or A3 Or Higher [Member]
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| Guarantor Obligations [Line Items] |
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| Unsecured Debt Ratings |
A-or A3 or higher |
| Interest Rate - Applicable Basis Points Above LIBOR |
1.00% |
| Facility Fee Basis Points |
0.175% |